Plastic



6. COMPOSITIONS,

COATING OR PLASTIC.

muted a. 6, 1925. UNITED STATES Examiner PATENT OFFICE.

WILLIAM HOSKINS, OF CHICAGO, ILLINOIS, ASSIGNOR T0 ECONOMY FUSE 8sMANUFAC- TUBING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEWYORK.

PLASTIC.

No Drawing.

To all whom it may concem:

Be it known that I, WILLIAM Hosxms, a

citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented new and useful Improvements inPlastics, of which the followmg is a specification.

In my prior application Ser. No. 452,953, filed March 17, 1921, issuedas Patent wept. 2, 1924, I have described a plastic material containingan aluminate of a metal derived from the alkaline and alkaline earthgroups as its sole (primary) cementitious constituent together with aninert or non-bonding filler, the material being caused to set or bond bythe addition of iq i .-c n aininanhosnha iw The present inventionrelates to improvements in the type of plastic materials thereinreferred to and has among its objects the production of such plasticmaterials of higl tensile stren that greatly reduced cost and theimprovement o f 'the characteristics of the cement gplastic)facilitating its commercial Handling.

In accordance with the present invention there is incorporated into aninert or nonbonding filler a suitable proportion of a phos haticmaterial such as bone ash hos- 0 138 roc e e, geter Wl l suclen su uricacid to react therewith and form e propor 1011 of phosphoric acidnecessary to cause the bonding or setting of the bonding constituent,which may be, for

example, sodium aluminate or calcium aluminate.

1e inert or non-bond filler employed may be any suitable 'fil e1 r ofdehydrating or nmating character, 40 such as silica crushed uartzasbestos aluminum oxlde, or other maEnal, the namristics of the variousbonding agents having been fully set forth in the prior applicationabove referred to.

In preparing a plastic material in accordance with the presentinvention, employing a p'hosphatic material and sulfuric acid, thedesired proportion of phos hatic material is first thorou hly admixedwith the filler to be employed. lhe necessary proportion of sulfuricacid for conversion of the phosphatic material and formation ofphosphoric acid is then added, the violence of reaction being greatlreduced by the inert material prescut. he resulting mixture, which isnor- Application filed February 21, 1923. Serial No. 620,502.

mally powdery and dry to the touch, is then admixed with a suitableproportion of the bonding material, which may, for example, be calciumaluminate. The resulting mixture may be stored for a considerableperiod, the proper proportion of water being added when it is desired toemploy the cement.

The proportion of phosphatic material to sulfuric acid should be atleast the combining ratio; preferably an excess should be employed. hestrength of sulfuric acid employed may be varied, various strengths from93% to about 50% H SO being found satisfactory in use. Preferably about65% H 80, is employed. The proportion of the aluminate binder may bevaried as disclosed in 1e prior application, for general technicalpurposes not exceeding 10% and ranging preferably from 1.5 to 4%. Thetotal proportions of hos hatic material and suluric acid shou e su men 0provide? very c0 siderable excess of phosphoric acid, say from 3 to 10times the proportion necessary theoretically for combination with thebinder.

In reparing the cement or plastic, the phosp atic material is firstmixed with the filler, any suitable non-bonding filler being employed.Thus crushed quartz, asbestine, clay, etc. may be employed, thecharacteristics of the various fillers being more fully set forth in Inprior application. The sulfuric acid is tien intermixed with the fillerand phosphatic material, and a dry, powdery mass is obtained. Thebinder, preferably calcium aluminate formed in the manner described inmy prior application, may then be admixed with the mass. Setting orbonding does not take place until water sufficient to wet the particlesof the mixture is added; 95 hence the mixture including the binder maybe stored or held for considerable periods before use. The amount ofwater added may vary from 6 to 12%.

It is to be noted that the products of reaction of the phosphaticmaterial and the sulfuric acid, aside from the phosphoric acid, form afinely divided filler which a pears to improve the characteristics of te product. Furthermore, a large excess of the 105 phosphatic materialmay be employed as a fill fi, if desired. b lded f e cement ay e mo intoorms in any desired manner. Where desired, a lubricant, such as a smallproportion of kerosene, may be included in the mixture in theinteraction of 1 to 10% of calcium alumimanner described in my priorapplication. nate, a phosphatic material and sulfuric The molded articlemay, if desired behmufi the roportions of the ph p edtowaccelerate itsset for example to 100 to 180 (1,55 described in my prior application.It is frequently advantageous to cure the mixture plastic prior tomolding it, the length of the period at which it is held varying withthe temperature. Thus at 40 to 50 C. it may be heldfor one to two hoursand at room temperature, one to two days.

The following examples illustrate the resent invention, the method ofadmixture be already described:

Bone ash 13 to 18%; filler (quartz) 50 to 62%; sulfuric acid (66 B.) 11to 17%; calcium aluminate (binder) 1.50 to 2.50%; aluminum oxide 2 to4%; water Bone ash 18 to 21.5%; quartz 53 to 6 a; sulfuric acid 14 to17%; aluminate binder 1.50 to 2%; aluminum oxide 2 to 2.5 o; water4 to5.5%.

giPhosphate rock, 14.5 to 19%; quartz 5 o 64%; sulfuric acid 12.5 to16%; alumina binder 2 to 4%; water 2 to 5%.

g Bone ash 19 to 27%; asbestine 35 to 5 0; sulfuric acid 15 to 19%;(ratio bone ash to sulfuric acid equal to from 1.05- 1.24 to 1); calciumaluminate 1.5 to 3%;

w r 6 to 10 0.

@Bone ash 23.6%; asbestine 47.2%; sulfu 1c acid 17.8%; calcium aluminate1.6%; aluminate 2.67%; water 7.21%. (The large efixlcess of bone ash inthis example acts as a Th s ecific details set forth in connection witthese examples are intended to illustrate the invention, but not to beregarded as limitations on its scope.

I claim:

1. A plastic com osition produced by the interaction of a p osphaticmaterial, sulfuric acid and an aluminate binder.

2. A plastic complosition produced by the interaction of a p osphaticmaterial, suliuriic acid and 1 to 10% of an aluminate 1n er.

3. A plastic composition produced by the phatic material with an inertfiller, a

terial an sulfuric acid being sufficient to provide an excem ofphosphoric acid over that required for reaction with the aluminate.

4. A plastic composition produced by the interactlon of 1 to 10% ofcalcium a minate, sulfuric acid, and phosphatic material in excess ofthat necessary for reaction with the sulfuric acid.

5. A plastic composition reduced by the interaction of an inert bin er,1 to 10% of calcium aluminate, a phosphatic material and sulfuric acid,the proportion of the latter being suflicient to provide an excess ofphosphoric acid over that required for reaction with the aluminate, andthe proportion of phosphatic material being in excess of that requiredto react with the sulfuric acid.

6. A cementitious composition produced by the interaction of phosphaterock 14 to 19%; a filler 58 to 64%; sulfuric acid 12% to 16%; aluminatebinder 2 to 4%.

7. The method of forming a plastic composition capable of setting onaddition of water which consists in mixing a phosphatic material with aninert filler, adding sulfuric acid thereto and mixing an aluminatebinder with the mixture.

8. The method of forming a plastic composition capable of setting onaddition of water which consists in mixing a hosphatic material with aninert filler, adding sulfuric acid thereto, the proportion of phosphaticmaterial being in excess of that required for reaction with the sulfuricacid, and mixing an aluminate binder in proportions of 1 to 10% with themixture.

9. The method of forming a plastic composition which consists in mixinga (phosdin sulfuric acid thereto, mixing an aluminatg binder with themixture, incorporating water tl erein and curing the resulting mixture.

WILLIAM HOSKINS.

